Material compacting device



Jan. 15, 1963 H. G. MILLER 3,073,219

MATERIAL COMPACTING DEVICE Filed May 25, 1959 2 Sheets-Sheet 1 lilm Ii IINVENTOR. Z a/204i J BY I 6 I y {m Jan. 15, 1963 H. G. MILLER MATERIALCOMPACTING DEVICE 2 Sheets-Sheet 2 Filed May 25, 1959 3,073,219 PatentedJan. 15, 1963 3,073,219 MATERIAL COMPACTING DEVICE Harold G. Miller,Racine, Wis., assignor to Racine Hydraulics and Machinery, Inc., acorporation of Wisconsin Filed May 25, 1959, Ser. No. 815,734 8 Claims.(Cl. 94-43) This invention relates to a material compacting device andmore particularly to a self-contained portable compactor.

An object of this invention is to provide a new and improvedself-contained portable compactor having a simple sturdy design with aminimum number of moving parts and which may be walked along whilesupported by an operator with minimum vibration effects on the operator.

Another object of the invention is to provide a selfcontained portablecompactor having a frame for supporting a motor mounted at one endthereof and an elongated frame section having a hollow interiorextending the length thereof with an open end, a driven piston of thesame cross section as said hollow interior slidably and non-rotatablyguided by the frame with an extension extending through said open frameand adapted to support a compacting tool, a drive piston of the samecross section as said hollow interior of the frame slidably andnon-rotatably guided by the frame, means driven by the motor forreciprocating said drive piston along a part of the length of said framesection, opposed elongated slots in the wall of said flame section alonga substantial part of the length thereof, a pair of oppositely extendingears on each of said pistons extending through and beyond said slots,and a plurality of springs extending from both sides of said drivenpiston ears and carried by the drive piston ears to resiliently transmitreciprocating movement of the drive piston in both directions to saiddriven piston whereby the compacting tool is given reciprocatingmovements.

Other and further objects and advantages of the invention will bereadily apparent from the following description and drawings in which:

FIG. 1 is a side elevational view of the compactor;

FIG. 2 is an end elevational view of the compactor;

FIG. 3 is a vertical section on an enlarged scale taken generally alongthe line 33 in FIG. 2 and with parts broken away;

FIG. 4 is a vertical section taken generally along the line 4-4 in FIG.3;

FIG. 5 is a horizontal section taken generally along the line 5-5 inFIG. 3; and

FIG. 6 is a horizontal section taken generally along the line 6-6 inFIG. 3.

While this invention is susceptible of embodiments in many differentforms, there is shown in the drawings and will herein be described indetail one specific embodiment with the understanding that the presentdisclosure is to be considered as an exemplification of the principlesof the invention and is not intended to limit the invention to theembodiment illustrated. The scope of the invention will be pointed outin the appended claims.

The self-contained portable compactor shown generally in FIGS. 1 and 2,has a frame, indicated generally at 10, with an elongated frame section11 slidably mounting a driven piston 12 carrying a compacting shoe 13.The driven piston 12 is resiliently reciprocated at a high rate of speedby means hereinafter described with power being provided by a motor,indicated generally at 14, which is mounted on the frame It). Acompactor has handle bars 15 attached to the frame thereof, as indicatedat 16, whereby an operator may hold the device during operation thereof.

The compactor frame 10 has an interior chamber 20 at an end thereof andthe motor 14 is mounted to the frame adjacent said chamber by an adaptorplate 21 which fits against a casing 22 of the motor and is securedthereto by machine screws 23. The motor adaptor plate 21 is also shapedto interfit with the frame and the adaptor plate is secured to the frameby cap screws 24 extending through the frame 10 and into the adaptorplate 21. A motor output shaft 25 extends into the frame chamber 21 andconnects to a centrifugal clutch 26 with the clutch connected to a driveshaft 27 spanning the chamber and rotatably mounted in bearings 28 and29. The drive shaft has a pinion gear 30 engaged with a bull gear 31 ona crank shaft having spaced apart sections 32 and 33 rotatable in theframe. The crank shaft sections 32 and 33 carry cranks 34 and 35respectively spaced from each other with a crank pin extendingtherebetween on which a connecting rod 36 is mounted. Back and forthmovements of the connecting rod 36 are transmitted to the driven piston12 by mechanism hereinafter described.

The elongated frame section 11 is composed of two generally U-shapedframe members 40 and 41 each formed integrally with frame parts 42 and43, respectively, which form the interior chamber 20. The frame 16 isconnected together along its length by the bolts 44, 45, 46, 47 and 48with the bolts '45, 46, 47 and 48 passing through the abutting parts ofthe frame members 40 and 41. With the frame members 40 and 41 joinedtogether the frame section 11 has a hollow interior of the shape shownin FIGS. 5 and 6 and which extends into communication with the interiorchamber 20 housing the gearing. Each of the frame members 40 and 41 isformed with spaced apart legs 50, 51 and 52, 53, respecwith the legs ofone frame member extending toward the other but spaced therefrom. Thisrelationship exists for the major part of the length of the elongatedframe section 11, except for where the frame members 40 and 41 abut eachother to in effect form a pair of opposed elongated slots 68 and 69substantially along the entire length of the elongated frame section 11.

The driven piston 12 has generally the same cross sectional shape as theinterior of the frame section 11 as noted in FIG. 6 and thus isnon-rotatably mounted. The drive piston 12 extends outwardly through anopen end 55 of the frame section 11 to support the tool 13.

A drive piston is mounted slidably within the frame section 1 1 and hasthe same cross sectional shape as the interior thereof whereby themulti-sided wall of the frame section holds the drive pistonnon-rotatably therewithin. The drive piston 60 is connected to theconnecting rod 36 at its upper end by a pin 61 whereby the back andforth movements of the connecting rod are transmitted to the drivepiston 60.

Means are provided for resiliently transmitting the reciprocatingmovement of the drive piston 60 to the driven piston 12 and thecompacting tool 13 comprising four sets of nested coil springs 62, 63,64 and 65.

The sets 62 and 63 of springs are mounted by placement between earsformed on the drive piston 60 and the driven piston 12. Moreparticularly, the drive piston 60 has a pair of laterally and oppositelyextending ears 66 and 67 which extend outwardly from the interior of theframe section 11 through the pair of opposed slots 68 and 6? formed bythe frame construction previously described. The driven piston 12 has asimilar pair of cars 70 and 71 which align with the drive piston ears 66and 67, respectively. The underside of the drive piston cars 66 and 67are flanged, as indicated at 72 and 73, to

thereby confine the upper ends of the spring sets 62 and 63, each sethaving three concentric springs disposed one within the other. Thedriven piston cars 70 and 71 are each apertured as shown at 75 and 76and receive flanged collars 77 and 78, respectively, which confine thelower ends of the spring sets 62 and 63. The spring sets 62 and 63 thusresiliently transmit force to the driven piston 12 resulting fromdownward movement of the drive piston 60.

The driven piston 12 is caused to resiliently follow the upward movementof the drive piston 66 by the spring sets 64 and 65. The spring sets 64and 65 each comprise a pair of springs positioned one within the otherand the upper ends thereof are confined by downwardly facing flangedcollars 7 and 80 positioned at the underside of the driven piston ears70 and 71. The lower ends of the springs in sets 64 and 65 are confinedby a pair of flanged collars 81 and 52 respectively which are aperturedto receive rods 83 and 84 which extend through the interior of thespring sets with the rod 83 passing through the aperture 75 in thedriven piston ear 7t? and threaded in an aperture 85 in the drive pistoncar 66. The rod 34 passes through the aperture 76 in the driven pistonear 71 and is threaded in an aperture 86 in the drive piston car 67. Therods 83 and 84 each have a nut 87 at the ends thereof to hold the rodsin assembled relation with the drive piston 69 and the collars 81 and 82for the lower ends of the spring sets 64 and 65. The

collars 77, 78, 79 and 80 mounted on the driven piston ears all haveplugs that fit into the ear apertures 75 and 76 to be confined againstmovement.

With the foregoing spring sets the compacting tool 13 is caused toresiliently compact material engaged thereby.

I claim:

1. A material compacting device comprising, a hollow frame having aninternal chamber at one end thereof and an elongated rigid hollowsection extending from the chamber with an opening in an end thereofremote from the chamber, means defining opposed elongated slots in thewall of said hollow section extending for substantially the entirelength 'of said elongated section, a drive piston slidably guided withinsaid elongated frame section with a pair of oppositely extending earsextending through said elongated slots, means extending from saidchamber to said drive piston for reciprocating said piston, a driventool carrying piston slidably guided in said elongated frame sectionbetween the drive piston and said frame opening with a pair ofoppositely extending ears extending through said elongated slots, afirst group of springs retained and extending between aligned ears ofsaid drive and driven pistons for transmitting force from the drivepiston to the driven piston, a pair of spring collars spaced from and atthe sides of the driven piston ears opposite from the drive piston ears,means connecting said collars to the drive piston, and a second'group ofsprings retained and extending between the collars and driven piston.ears for opposing movement of the latter ears and collars toward eachother.

2. A material compacting device comprising, a hollow frame having aninternal chamber generally at one end thereof and an elongated rigidhollow section extending from the chamber with an opening in an endthereof remote from. the chamber, means defining opposed elon- V gatedslots in the wall of said hollow section extending for substantially theentire length of said elongated section, a drive piston slidably guidedwithin said elongated frame section with a pair of oppositely extendingflanged ears extendingthrough said elongated slots, means extending fromsaid chamber to said drive piston for reciprocating said piston, adriven tool carrying piston slidably guided in said elongated framesection between thedrive piston and said opening with a pair ofoppositely extending apertured and flanged ears extending through saidelongated slots to align with the drive piston ears, a pair of flangedspring collars aligned one with each aligned set of ears at the side ofthe driven piston cars opposite from the drive piston ears, a pair ofrods associated one with each aligned set of ears and removablyconnecting a drive piston ear and a collar, two sets of springs with oneset extending between each pair of aligned piston ears and confined bythe ear flanges for transmitting force from the drive piston to thedriven piston, and two additional sets of springs with one set extendingbetween each aligned driven piston ear and collar and confined by theflanges thereon to resiliently maintain the spacing between the drivenpiston ears and collars, each of said rods being secured to a drivepiston ear and passing through two of said sets of springs and movablyextending through the driven piston ear aperture.

3. A self-contained portable compactor having a frame with an interiorchamber at an end thereof, a motor mounted on the frame with a driveshaft extending into said chamber, an elongated frame section extendingfrom the chamber area having a hollow interior extending the lengththereof between said chamber and an open end of the frame, a drivenmember of the same cross section as said hollow interior slidably andnon-rotatably guided by the frame with an extension extending throughsaid open end adapted to support a compacting tool, a drive member ofthe same cross section as said hollow interior located between thedriven member and said chamber and slidably and non-rotatably guided bythe frame, means connected between the drive shaft and drive member forreciprocating said drive member along a part of the length of said framesection, opposed elongated slots in the wall of said frame sectionextending along a substantial part of said frame section length, a pairof oppositely extending ears on each of said members extending throughand beyond said slots, and a plurality of springs extend: ing from bothsides of said driven member ears with upper springs between the driveand driven piston ears and lower springs at the other side of the drivenpiston ears, and means movable with the drive pistonv for bolding thelower springs in place.

4. A self-contained portable compactor as defined in claim 3 in whichsaid elongated frame section consists of a pair of joined generallyU-shaped frame members with the legs of the U-shaped members directedtoward each other to form the hollow interior for the frame section withsaid elongated slots being formed by spaces between said egs.

5. A material compacting device comprising, an elongated hollow framewith an opening in an end thereof, means defining opposed elongatedslots in the wall of said hollow frame extending for substantially theentire length thereof, a drive piston slidably guided within said framewith a pair of oppositely extending flanged ears extending through saidelongated slots, a driven tool carrying piston slidably guided in saidelongated frame between the drive piston and said opening with a pair ofoppositely extending apertured and flanged ears extending through saidelongated slots, a pair of flanged spring collars aligned one with eachaligned set of ears at the side of the driven piston ears opposite fromthe drive piston ears, two sets of nested springs with one set extendingbetween each pair of aligned piston ears and confined by the ear flangesfor transmitting force to the driven piston, and two additional sets ofsprings with one set extending between each aligned driven piston earand collar and confined by the flanges to resiliently oppose movement ofthe driven piston relative to the drive piston, and a pair of rodsassociated one with each aligned set of cars, each rod being connectedto a driven piston ear and a collar and movably extending through setsof springs and a driven piston ear.

6. A compacting device as defined in claim 5 in which the frame has aninterior chamber at the other end thereof, a motor adjacent the chamberwith a drive output shaft extending into said chamber, means mountingthe motor on the frame including an adaptor plate shaped to interfitwith the frame, fastening means attaching the motor casing to saidplate, and means passing through the frame and attached to the plate forconnecting the plate and motor to the frame.

7. A material compacting device comprising, in combination, a casinghaving a pair of spaced apart elongate openings, a drive plunger movablyguided within the easing, a driven tool carrying plunger also movablyguided in said casing and in spaced relation with said drive plunger,said drive and driven plungers each having a pair of ears extendingoppositely from each other through the casing openings to locationsexternally of the casing, first spring means extended between a driveplunger ear and a driven plunger ear at one side of the casing, secondspring means extended between a drive plunger ear and a driven plungerear at a side of the casing opposite from said first spring means,resilient means engaging the driven plunger ears at the side thereofremote from the drive plunger opposing movement of the driven plungeraway from the drive plunger, and means carried by the drive plunger tohold said resilient means in place.

8. A self-contained portable Compactor having a frame with an interiorchamber and an elongate frame section extending from the chamber areahaving a hollow interior extending the length thereof between saidchamber and an open end of the frame, a driven member in said hollowinterior movably guided by the frame with an extension extending throughsaid open end adapted to support a compacting tool, a drive member insaid hollow interior located between the driven member and said chamberand movably guided by the frame, means for reciprocating said drivemember along a part of the length of said frame section, opposedelongated openings in the wall of said frame section extending along asubstantial part of said frame section length, a pair of oppositelyextending ears on each of said members extending through and beyond saidopenings, and spring means extending from both sides of said drivenmember ears including springs between the drive and driven member earsand springs at the other side of the driven piston ears, and meanscarried by the drive member to hold the last mentioned springs in place.

References Cited in the file of this patent UNITED STATES PATENTS849,506 Shadall Apr. 9, 1907 2,038,416 Clifford Apr. 21, 1936 2,677,355Maurer May 4, 1954 2,845,050 Wacker July 29, 1958 2,942,589 Wacker June28, 1960 FOREIGN PATENTS 718,276 Germany Mar. 7, 1942 321,787Switzerland July 15, 1957 327,195 Switzerland Mar. 15, 1958

1. A MATERIAL COMPACTING DEVICE COMPRISING, A HOLLOW FRAME HAVING ANINTERNAL CHAMBER AT ONE END THEREOF AND AN ELONGATED RIGID HOLLOWSECTION EXTENDING FROM THE CHAMBER WITH AN OPENING IN AN END THEREOFREMOTE FROM THE CHAMBER, MEANS DEFINING OPPOSED ELONGATED SLOTS FROM THECHAMBER, MEANS DEFINING OPPOSED ELONGATED SLOTS IN THE WALL OF SAIDHOLLOW SECTION EXTENDING FOR SUBSTANTIALLY THE ENTIRE LENGTH OF SAIDELONGATED SECTION, A DRIVE PISTON SLIDABLY GUIDED WITHIN SAID ELONGATEDFRAME SECTION WITH A PAIR OF OPPOSITELY EXTENDING EARS EXTENDING THROUGHSAID ELONGATED SLOTS, MEANS EXTENDING FROM SAID CHAMBER TO SAID DRIVEPISTON FOR RECIPROCATING SAID PISTON, A DRIVEN TOOL CARRYING PISTONSLIDABLY GUIDED IN SAID ELONGATED FRAME SECTION BETWEEN THE DRIVE PISTONAND SAID FRAME OPENING WITH A PAIR OF OPPOSITELY EXTENDING EARSEXTENDING THROUGH SAID ELONGATED SLOTS, A FIRST GROUP OF SPRINGSRETAINED AND EXTENDING BETWEEN ALIGNED EARS OF SAID DRIVE AND DRIVENPISTONS FOR TRANSMITTING FORCE FROM THE DRIVE PISTON TO THE DRIVENPISTON, A PAIR OF SPRING COLLARS SPACED FROM AND AT THE SIDES OF THEDRIVEN PISTON EARS OPPOSITE FROM THE DRIVE PISTON EARS, MEANS CONNECTINGSAID COLLARS TO THE DRIVE PISTON, AND A SECOND GROUP OF SPRINGS RETAINEDAND EXTENDING BETWEEN THE COLLARS AND DRIVEN PISTON EARS FOR OPPOSINGMOVEMENT OF THE LATTER EARS AND COLLARS TOWARD EACH OTHER.